Intake manifold system for internal combustion engines



June 7, 1938- o. c. FuhlDr-:RBLJIRK4 2,119,707

INTAKE MANIFOLD SYSTEM FOR INTERNAL COMBUSTION ENGINES original Filed Nov. 2o, 1955 2 sheets-sheet 1 ATTORN EY `lune 7, 1938. Q C; FUNERBURK 2,119,707

INTAKE MANIFOLD SYSTEM FORn INTERNAL COMBUSTION ENGINES Original Filed Nov. 20, 1955 2 Sheets-Sheet 2 Patented June 7, 1938 INTAKE MANIFOLD SYSTEM FOR INTERNAL I COMBUSTION ENGINES Otis C. Funderburk, Weston, Mass.

Continuation of application Serial No. 698,761, November 20, 1933. This application July 13, 1936, Serial No. 90,362

13 Claims. (Cl. 12S-52) tion of my copending application, Serial Number My invention overcomes this difficulty and at 698,761, filed November 20, 1933. the same time provides short and direct conduits In this sort of engine it is common to employ from the manifolds to the cylinders whereby the as many intake manifolds as there are banks of combustible mixture is easily drawn into the cylinders. Each manifold is fed by a carburetor cylinders and high volumetric efficiency is oband feeds the combustible mixture to one bank tained. 10-

of cylinders to which its main chamber is usually In the drawings is shown an example of my inadjacent. Itis desirable to provide separate vention applied to an -cylinder V engine'ascarburetting and manifolding systems in these sumed to have the firing order 1, 5, 4, 8, 6, 3, 7,

engines because of their high rotative speeds 2, 1.

l which necessitate maintaining the intake valves Fig. l is a plan view partly in section.

or ports open for a substantially longer period Fig. 2 is an elevation on the line 2 2, Fig. 1. Y than that of the suction stroke of the piston. In Fig'. 3 is an elevation on the line 3 3, Fig. 1. many such multi-cylinder engines, it is neces- Fig. 4 is an elevation on the line 4 4, Fig.' l.

,y sary in order to get a full weight of charge into Fig. 5 is an elevation on the line 5 5, Fig.Y 1. the cylinders to begin to open the intake valves Fig. 6 is a diagrammatic view of the two banks 20 or ports before top dead center and to keep them comprising the 8cylindersof the engine to which open for a considerable period after bottom dead my invention is applied. l center. The intake valves or ports of two or I provide two intake manifolds A and B which even three or more cylinders are open at the are functionally separate from one another, each same time depending on the number of cyln- -fed by an intake pipe C from a carburetor. 25

ders in the engine. These two manifolds are preferably made to- When all of the cylinders of such an engine gether from stampings from which there arev are fed from a single intake manifold, a cylinbottom members D and D and a topmember E der in which the piston is moving most rapidly, suitably secured together by folding. the pe as during the middle Aof its suction stroke, is ripheral edge of member D forming a lock seam 30 drawing the mixture from the manifold more retaining members-DD and E in fixed relation. powerfully than a cylinder in which the piston Member D is made of .a substantially uniis moving comparatively slowly at an end of its planarsection while member D is formed with suction stroke. The result is that each cylina fiat peripheral ange I-I and a raised area havder, when exerting its most powerful suction, ing longitudinally downwardly inclined converg- 35 robs the other cylinders, which are then exerting ing wall sections and formed with a concave a less effective suction, or" some of the combustitransverse portion having its maximum curvable mixture. The cylinders hence fail to receive turetoward the central portion Vof the plate D as the weight of charge which they should receive'. particularly shown in Figures 2 and 3. Member This causes loss in volumetricA efficiency and E is also formed witha flat peripheral edge I and 40 hence in power. Y a dome like central portion on which are suitably It has been customary to use separate carsupported the pipes C. 'A longitudinally vertical buretting and manifolding systems in engines partition F located between pipes `C and C dihaving two or more banks of cylinders, each vides the space-enclosed by stamping members 'bank being served by one such system. E and D into two manifold chambers. The ver- 45 Difiiculties in manifolding have been encountical partition F, .as shown in Figure 5, is proy tered in enginesV of this sort having firing orders vided with openingsformed to receive one end by which some of' the cylinders of one bank of pipes I; which interconnect partition F with suck successively. For example, in an 8-cylin'der openings formed on the plate member D', these engine of the \l type equipped with a 9G crank pipes passing through openingsv formed lin the 50 shaft, .a firing order imposed byconditions of flangepo'rtion I-I of member D. Members D and optimum running is 1, 5, el, 8, 5, 3, 7, 2, l, etc., D areV also formed with ccincidental spaced the cylinders of one bank being numbered l openings to which are xedly secured the short to 4 and the cylinders of the other bank 5 to 8. conduits a. The carburetor system is preferably 5? With the usual arrangement of feeding eachA This invention relates to a manifold system for internal combustion engines, particularly of the type in which there are two or more, i. e., multiple banks of cylinders, and is a continuabank of cylinders from an a-djacent manifold, there are successive suctions from the same manifold and consequently there is the loss in volumetric efficiency and power as above described.

`of the downdraft type and the pipe C from the carburetor leads the mixture downward and adjacent to the bottom of the chamber which preferably may consist at that place of a concave plate portion G of member D heated by exhaust gases or otherwise, the exhaust gases being conveyed and passing through the openings formed on the base plate D to the space formed between plate D' and the raised area ci' the intermediate member D as particularly shown in Figure 3.

The cylinders of one bank are numbered I, 2, 8, 4 and the cylinders of the other bank are numbered 5, 6, l and 8. Cylinders I and 4 are connected by pipes a, a, to the adjacent manifold chamber A and cylinders 5 and 8 are likewise connected to adjacent manifold chamber B. Cylinders 2 and 3 are connected by pipes b, b, shown as passing through the adjacent manifold chamber A, to the manifold chamber B on the other side of the central partition and cylinders 6 and 'l are likewise connected to chamber A. All of the pipes or conduits are short and direct and offer but little resistance to the free flow of the mixture to the cylinders whereby volumetric efficiency is not impaired.

By these means the cylinders having the firing order l, 5, 4, 8, 6, 3, 7, 2, 1 successively draw the mixture alternately from the two intake manifold chambers. My invention, however, is not limited to V engines or to engines having this particular firing order but may be adapted to any engine having multiple banks of cylinders and a firing order in which, in order that successively firing cylinders may draw alternately from separate manifolds, each manifold feeds some of the cylinders of separate banks.

' the dome like cover and said element into two manifolding chambers; the flat sections of said cover and element formed with aligned openings; the vertically disposed member formed with openings therein; conduit means interconnecting the openings of the vertically disposed member with the openings of the cover and element; and tubular members secured to the dome like cover providing means to connect carbureting means to the manifolds.

2. Manifold means adapted for use in internal combustion engines including a dome like cover having a flat peripheral ilange; a sheet metal element having a flat section engaging the peripheral flange of said cover and having a raised p0rtion formed having longitudinally inclined downwardly converging wall sections; a vertically disposed member dividing the compartment formed between the dome like cover and said element into two manifolding chambers; the flat sections of said cover and element formed with aligned openings; the vertically disposed member formed with openings therein;` conduit means interconnecting the openings Yof the vertically disposed member with the openings of the cover and element; and tubular members secured to the dome like cover providing means to connect'the carburetor means to the manifolds.

3. Manifold means adapted for use in internal combustion engines including a sheet metal base plate; a dome like cover having a at peripheral flange; an intermediate sheet metal member formed with a flat edge portion and having a central raised portion; means for locking the base plate, dome like cover and intermediate member together by their peripheral edges forming thereby two closed compartments; a vertically disposed member dividing the compartment formed between the dome like member and the intermediate member into two manifolding chambers; the base plate provided with openings; the vertically disposed member provided with openings; conduit means interconnecting the openings formed on the base plate and the openings formed on the vertically disposed member; and conduits secured to the dome like cover providing means to connect carbureting means to the manifolds.

4. Manifolding means adapted for use in internal combustion engines comprising a sheet metal base plate; a sheet metal dome like cover; a sheet metal member positioned between the base plate and dome like cover dividing the space between the base plate and the dome like cover into two separate passage ways; said base plate having openings formed therein acting as conduit means from each of said passage ways; and said dome like cover having openings formed therein for connecting carbureting means to one of said passage ways.

5. Manifold means adapted for use in internal combustion engines including a substantially flat sheet metal base plate; a dome like cover having a flat peripheral flange; an intermediate sheet metal member formed with a flat edge portion and a raised central portion; the edge of the base plate being formed to hold and lock to the base plate the peripheral flange of the cover and the edge of the intermediate member forming two independent passage-ways; the base plate being provided with openings for each of said passageways; and the dome like cover being provided with openings providing means to connect carbureting means to one of said passage-ways.

6. Manifold means adapted for use in internal combustion engines including a substantially flat sheet metal base plate; a dome like cover having a flat peripheral flange; an intermediate sheet metal member formed with a flat edge portion and a raised central portion; the edge of the base plate being formed to hold and lock with the base plate the peripheral flange of the cover and the edge of the intermediate member forming two independent passage-ways, the base plate being provided with openings for each of said passageways; a vertically disposed member dividing the passage-way formed between the dome like cover and the intermediate member into two independent manifolding chambers; and the dome like cover being provided with openings for providing means to connect carbureting means to each of said manifolding chambers.

'7. Manifold means adapted for use in internal combustion engines including a substantially flat sheet metal base plate; a dome like cover having a flat peripheral flange; an intermediate sheet.

metal member formed with a dat edge portion and a raised portion having longitudinally inclined downwardly convergingwall sections toward the center of said member; .the edge of the.

base plate being folded to hold and lock to the base plate the peripheral flange of the cover and the edge of the intermediate member forming two independent passage-ways; the base plate being provided with openings for each of said passageways; and the dome like cover being provided lll r intermediate member with openings providing means to connect carbureting means to one of said passage-ways.

8. Manifold means adapted for use in internal combustion engines including a substantially flat sheet metal base plate; a dome like cover having a flat peripheral flange; an intermediate sheet metal member formed with a flat edge portion and a raised central portion; the edge of the base plate being formed to hold and lock with the base plate the peripheral flange of the cover and the edge of the intermediate member forming two independent passage-ways; a vertically disposed member dividing the passageway formed between the dome like cover and the into two independent manifolding chambers, said vertically disposed member being provided with spaced openings; the base plate being provided with openings for each of said passage-ways; conduit means connecting some of the openings of the base plate for one of said passage-ways with the openings of said vertically disposed member; and the dome like cover being provided with openings for providing means to connect carbureting means to each of said manifoldingchambers.

9. A pressed sheet metal manifold including a plate having openings through which fuel may be delivered to cylinder intake ports, a second plate secured to the first-mentioned plate with its marginal portions lying flush against the surface of the first mentioned plate, said second mentioned plate having a portion pressed outwardly away from the first mentioned plate to provide a fuel receiving chamber between the plates, and a sheet metal partition fixed in said chamber and dividing the same into a plurality of passages.

l0. A pressed sheet metal manifold including a base plate, an intermediate plate and a cover plate secured together with the marginal por-A tions of the intermediate plate lying iiush against the surfaces of the base and cover plates, said base and intermediate plates being provided with openings through which fuel may be delivered to cylinder intake ports and said intermediate plate being provided with a portion pressed outwardly away from the base plate to form a chamber adapted to receive a heating medium, said cover plate having an outwardly pressed portion enclosing and spaced from the outwardly .pressed portion of the intermediate plate to provide a fuel receiving chamber, and means disposed between the outwardly pressed portions of the intermediate and cover plates dividing the interior of the fuel receiving chamber into` a plurality of passages.

ll. A pressed sheet metal manifold comprising a base plate having openings through which fuel may be delivered to cylinder intake ports, a second plate secured to the base plate and having openings registering with the openings in the base plate, the major portion of the second plate lying flush against the upper surface of the base plate but said second plate having an upwardly pressed portion cooperating with the base plate to form a chamber adapted to receive a heating medium, a cover plate having portions lying flush against said second plate and having an upwardly pressed portion enclosing and spaced from the upwardly pressed portion of said second plate to provide a fuel receiving chamber,'said cover plate being secured to the base plate, and a sheet metal partition between the raised portion of the second plate and the raised portion of the cover plate dividing the interior of the fuel vreceiving chamber into a plurality of passages.

12. A pressed sheet metal manifold including a plate having openings through which fuel may be delivered to cylinder intake ports, asecond plate secured to the first mentioned plate with its marginal portions lying flush against the surface of the first-mentioned plate, one of said plates having a portion pressed outwardly away from the other plate to provide fuel conducting passages communicating with the said openings, and means for supplying an explosive mixture to said fuel conducting passages.

13. A pressed sheet metal manifold including a plate having openings through which fuel may be delivered to cylinder intake ports, a second plate secured to the first-mentioned plate with its marginal portions lying flush against the surface of the first mentioned plate, one of said plates hav'- ing a portion pressed outwardly away from the other plate to provide a fuel receiving chamber, and means disposed in the said chamber dividing the interior thereof into a plurality of passages. Y

OTIS C. FUNDERBURK. 

